[NETFILTER]: ipt_TCPMSS: misc cleanup

[hh.org.git] / include / rdma / ib_verbs.h

/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: ib_verbs.h 1349 2004-12-16 21:09:43Z roland $
 */

#if !defined(IB_VERBS_H)
#define IB_VERBS_H

#include <linux/types.h>
#include <linux/device.h>

#include <asm/atomic.h>
#include <asm/scatterlist.h>
#include <asm/uaccess.h>

union ib_gid {
        u8      raw[16];
        struct {
                __be64  subnet_prefix;
                __be64  interface_id;
        } global;
};

enum ib_node_type {
        IB_NODE_CA      = 1,
        IB_NODE_SWITCH,
        IB_NODE_ROUTER
};

enum ib_device_cap_flags {
        IB_DEVICE_RESIZE_MAX_WR         = 1,
        IB_DEVICE_BAD_PKEY_CNTR         = (1<<1),
        IB_DEVICE_BAD_QKEY_CNTR         = (1<<2),
        IB_DEVICE_RAW_MULTI             = (1<<3),
        IB_DEVICE_AUTO_PATH_MIG         = (1<<4),
        IB_DEVICE_CHANGE_PHY_PORT       = (1<<5),
        IB_DEVICE_UD_AV_PORT_ENFORCE    = (1<<6),
        IB_DEVICE_CURR_QP_STATE_MOD     = (1<<7),
        IB_DEVICE_SHUTDOWN_PORT         = (1<<8),
        IB_DEVICE_INIT_TYPE             = (1<<9),
        IB_DEVICE_PORT_ACTIVE_EVENT     = (1<<10),
        IB_DEVICE_SYS_IMAGE_GUID        = (1<<11),
        IB_DEVICE_RC_RNR_NAK_GEN        = (1<<12),
        IB_DEVICE_SRQ_RESIZE            = (1<<13),
        IB_DEVICE_N_NOTIFY_CQ           = (1<<14),
};

enum ib_atomic_cap {
        IB_ATOMIC_NONE,
        IB_ATOMIC_HCA,
        IB_ATOMIC_GLOB
};

struct ib_device_attr {
        u64                     fw_ver;
        __be64                  sys_image_guid;
        u64                     max_mr_size;
        u64                     page_size_cap;
        u32                     vendor_id;
        u32                     vendor_part_id;
        u32                     hw_ver;
        int                     max_qp;
        int                     max_qp_wr;
        int                     device_cap_flags;
        int                     max_sge;
        int                     max_sge_rd;
        int                     max_cq;
        int                     max_cqe;
        int                     max_mr;
        int                     max_pd;
        int                     max_qp_rd_atom;
        int                     max_ee_rd_atom;
        int                     max_res_rd_atom;
        int                     max_qp_init_rd_atom;
        int                     max_ee_init_rd_atom;
        enum ib_atomic_cap      atomic_cap;
        int                     max_ee;
        int                     max_rdd;
        int                     max_mw;
        int                     max_raw_ipv6_qp;
        int                     max_raw_ethy_qp;
        int                     max_mcast_grp;
        int                     max_mcast_qp_attach;
        int                     max_total_mcast_qp_attach;
        int                     max_ah;
        int                     max_fmr;
        int                     max_map_per_fmr;
        int                     max_srq;
        int                     max_srq_wr;
        int                     max_srq_sge;
        u16                     max_pkeys;
        u8                      local_ca_ack_delay;
};

enum ib_mtu {
        IB_MTU_256  = 1,
        IB_MTU_512  = 2,
        IB_MTU_1024 = 3,
        IB_MTU_2048 = 4,
        IB_MTU_4096 = 5
};

static inline int ib_mtu_enum_to_int(enum ib_mtu mtu)
{
        switch (mtu) {
        case IB_MTU_256:  return  256;
        case IB_MTU_512:  return  512;
        case IB_MTU_1024: return 1024;
        case IB_MTU_2048: return 2048;
        case IB_MTU_4096: return 4096;
        default:          return -1;
        }
}

enum ib_port_state {
        IB_PORT_NOP             = 0,
        IB_PORT_DOWN            = 1,
        IB_PORT_INIT            = 2,
        IB_PORT_ARMED           = 3,
        IB_PORT_ACTIVE          = 4,
        IB_PORT_ACTIVE_DEFER    = 5
};

enum ib_port_cap_flags {
        IB_PORT_SM                              = 1 <<  1,
        IB_PORT_NOTICE_SUP                      = 1 <<  2,
        IB_PORT_TRAP_SUP                        = 1 <<  3,
        IB_PORT_OPT_IPD_SUP                     = 1 <<  4,
        IB_PORT_AUTO_MIGR_SUP                   = 1 <<  5,
        IB_PORT_SL_MAP_SUP                      = 1 <<  6,
        IB_PORT_MKEY_NVRAM                      = 1 <<  7,
        IB_PORT_PKEY_NVRAM                      = 1 <<  8,
        IB_PORT_LED_INFO_SUP                    = 1 <<  9,
        IB_PORT_SM_DISABLED                     = 1 << 10,
        IB_PORT_SYS_IMAGE_GUID_SUP              = 1 << 11,
        IB_PORT_PKEY_SW_EXT_PORT_TRAP_SUP       = 1 << 12,
        IB_PORT_CM_SUP                          = 1 << 16,
        IB_PORT_SNMP_TUNNEL_SUP                 = 1 << 17,
        IB_PORT_REINIT_SUP                      = 1 << 18,
        IB_PORT_DEVICE_MGMT_SUP                 = 1 << 19,
        IB_PORT_VENDOR_CLASS_SUP                = 1 << 20,
        IB_PORT_DR_NOTICE_SUP                   = 1 << 21,
        IB_PORT_CAP_MASK_NOTICE_SUP             = 1 << 22,
        IB_PORT_BOOT_MGMT_SUP                   = 1 << 23,
        IB_PORT_LINK_LATENCY_SUP                = 1 << 24,
        IB_PORT_CLIENT_REG_SUP                  = 1 << 25
};

enum ib_port_width {
        IB_WIDTH_1X     = 1,
        IB_WIDTH_4X     = 2,
        IB_WIDTH_8X     = 4,
        IB_WIDTH_12X    = 8
};

static inline int ib_width_enum_to_int(enum ib_port_width width)
{
        switch (width) {
        case IB_WIDTH_1X:  return  1;
        case IB_WIDTH_4X:  return  4;
        case IB_WIDTH_8X:  return  8;
        case IB_WIDTH_12X: return 12;
        default:          return -1;
        }
}

struct ib_port_attr {
        enum ib_port_state      state;
        enum ib_mtu             max_mtu;
        enum ib_mtu             active_mtu;
        int                     gid_tbl_len;
        u32                     port_cap_flags;
        u32                     max_msg_sz;
        u32                     bad_pkey_cntr;
        u32                     qkey_viol_cntr;
        u16                     pkey_tbl_len;
        u16                     lid;
        u16                     sm_lid;
        u8                      lmc;
        u8                      max_vl_num;
        u8                      sm_sl;
        u8                      subnet_timeout;
        u8                      init_type_reply;
        u8                      active_width;
        u8                      active_speed;
        u8                      phys_state;
};

enum ib_device_modify_flags {
        IB_DEVICE_MODIFY_SYS_IMAGE_GUID = 1 << 0,
        IB_DEVICE_MODIFY_NODE_DESC      = 1 << 1
};

struct ib_device_modify {
        u64     sys_image_guid;
        char    node_desc[64];
};

enum ib_port_modify_flags {
        IB_PORT_SHUTDOWN                = 1,
        IB_PORT_INIT_TYPE               = (1<<2),
        IB_PORT_RESET_QKEY_CNTR         = (1<<3)
};

struct ib_port_modify {
        u32     set_port_cap_mask;
        u32     clr_port_cap_mask;
        u8      init_type;
};

enum ib_event_type {
        IB_EVENT_CQ_ERR,
        IB_EVENT_QP_FATAL,
        IB_EVENT_QP_REQ_ERR,
        IB_EVENT_QP_ACCESS_ERR,
        IB_EVENT_COMM_EST,
        IB_EVENT_SQ_DRAINED,
        IB_EVENT_PATH_MIG,
        IB_EVENT_PATH_MIG_ERR,
        IB_EVENT_DEVICE_FATAL,
        IB_EVENT_PORT_ACTIVE,
        IB_EVENT_PORT_ERR,
        IB_EVENT_LID_CHANGE,
        IB_EVENT_PKEY_CHANGE,
        IB_EVENT_SM_CHANGE,
        IB_EVENT_SRQ_ERR,
        IB_EVENT_SRQ_LIMIT_REACHED,
        IB_EVENT_QP_LAST_WQE_REACHED,
        IB_EVENT_CLIENT_REREGISTER
};

struct ib_event {
        struct ib_device        *device;
        union {
                struct ib_cq    *cq;
                struct ib_qp    *qp;
                struct ib_srq   *srq;
                u8              port_num;
        } element;
        enum ib_event_type      event;
};

struct ib_event_handler {
        struct ib_device *device;
        void            (*handler)(struct ib_event_handler *, struct ib_event *);
        struct list_head  list;
};

#define INIT_IB_EVENT_HANDLER(_ptr, _device, _handler)          \
        do {                                                    \
                (_ptr)->device  = _device;                      \
                (_ptr)->handler = _handler;                     \
                INIT_LIST_HEAD(&(_ptr)->list);                  \
        } while (0)

struct ib_global_route {
        union ib_gid    dgid;
        u32             flow_label;
        u8              sgid_index;
        u8              hop_limit;
        u8              traffic_class;
};

struct ib_grh {
        __be32          version_tclass_flow;
        __be16          paylen;
        u8              next_hdr;
        u8              hop_limit;
        union ib_gid    sgid;
        union ib_gid    dgid;
};

enum {
        IB_MULTICAST_QPN = 0xffffff
};

#define IB_LID_PERMISSIVE       __constant_htons(0xFFFF)

enum ib_ah_flags {
        IB_AH_GRH       = 1
};

enum ib_rate {
        IB_RATE_PORT_CURRENT = 0,
        IB_RATE_2_5_GBPS = 2,
        IB_RATE_5_GBPS   = 5,
        IB_RATE_10_GBPS  = 3,
        IB_RATE_20_GBPS  = 6,
        IB_RATE_30_GBPS  = 4,
        IB_RATE_40_GBPS  = 7,
        IB_RATE_60_GBPS  = 8,
        IB_RATE_80_GBPS  = 9,
        IB_RATE_120_GBPS = 10
};

/**
 * ib_rate_to_mult - Convert the IB rate enum to a multiple of the
 * base rate of 2.5 Gbit/sec.  For example, IB_RATE_5_GBPS will be
 * converted to 2, since 5 Gbit/sec is 2 * 2.5 Gbit/sec.
 * @rate: rate to convert.
 */
int ib_rate_to_mult(enum ib_rate rate) __attribute_const__;

/**
 * mult_to_ib_rate - Convert a multiple of 2.5 Gbit/sec to an IB rate
 * enum.
 * @mult: multiple to convert.
 */
enum ib_rate mult_to_ib_rate(int mult) __attribute_const__;

struct ib_ah_attr {
        struct ib_global_route  grh;
        u16                     dlid;
        u8                      sl;
        u8                      src_path_bits;
        u8                      static_rate;
        u8                      ah_flags;
        u8                      port_num;
};

enum ib_wc_status {
        IB_WC_SUCCESS,
        IB_WC_LOC_LEN_ERR,
        IB_WC_LOC_QP_OP_ERR,
        IB_WC_LOC_EEC_OP_ERR,
        IB_WC_LOC_PROT_ERR,
        IB_WC_WR_FLUSH_ERR,
        IB_WC_MW_BIND_ERR,
        IB_WC_BAD_RESP_ERR,
        IB_WC_LOC_ACCESS_ERR,
        IB_WC_REM_INV_REQ_ERR,
        IB_WC_REM_ACCESS_ERR,
        IB_WC_REM_OP_ERR,
        IB_WC_RETRY_EXC_ERR,
        IB_WC_RNR_RETRY_EXC_ERR,
        IB_WC_LOC_RDD_VIOL_ERR,
        IB_WC_REM_INV_RD_REQ_ERR,
        IB_WC_REM_ABORT_ERR,
        IB_WC_INV_EECN_ERR,
        IB_WC_INV_EEC_STATE_ERR,
        IB_WC_FATAL_ERR,
        IB_WC_RESP_TIMEOUT_ERR,
        IB_WC_GENERAL_ERR
};

enum ib_wc_opcode {
        IB_WC_SEND,
        IB_WC_RDMA_WRITE,
        IB_WC_RDMA_READ,
        IB_WC_COMP_SWAP,
        IB_WC_FETCH_ADD,
        IB_WC_BIND_MW,
/*
 * Set value of IB_WC_RECV so consumers can test if a completion is a
 * receive by testing (opcode & IB_WC_RECV).
 */
        IB_WC_RECV                      = 1 << 7,
        IB_WC_RECV_RDMA_WITH_IMM
};

enum ib_wc_flags {
        IB_WC_GRH               = 1,
        IB_WC_WITH_IMM          = (1<<1)
};

struct ib_wc {
        u64                     wr_id;
        enum ib_wc_status       status;
        enum ib_wc_opcode       opcode;
        u32                     vendor_err;
        u32                     byte_len;
        __be32                  imm_data;
        u32                     qp_num;
        u32                     src_qp;
        int                     wc_flags;
        u16                     pkey_index;
        u16                     slid;
        u8                      sl;
        u8                      dlid_path_bits;
        u8                      port_num;       /* valid only for DR SMPs on switches */
};

enum ib_cq_notify {
        IB_CQ_SOLICITED,
        IB_CQ_NEXT_COMP
};

enum ib_srq_attr_mask {
        IB_SRQ_MAX_WR   = 1 << 0,
        IB_SRQ_LIMIT    = 1 << 1,
};

struct ib_srq_attr {
        u32     max_wr;
        u32     max_sge;
        u32     srq_limit;
};

struct ib_srq_init_attr {
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *srq_context;
        struct ib_srq_attr      attr;
};

struct ib_qp_cap {
        u32     max_send_wr;
        u32     max_recv_wr;
        u32     max_send_sge;
        u32     max_recv_sge;
        u32     max_inline_data;
};

enum ib_sig_type {
        IB_SIGNAL_ALL_WR,
        IB_SIGNAL_REQ_WR
};

enum ib_qp_type {
        /*
         * IB_QPT_SMI and IB_QPT_GSI have to be the first two entries
         * here (and in that order) since the MAD layer uses them as
         * indices into a 2-entry table.
         */
        IB_QPT_SMI,
        IB_QPT_GSI,

        IB_QPT_RC,
        IB_QPT_UC,
        IB_QPT_UD,
        IB_QPT_RAW_IPV6,
        IB_QPT_RAW_ETY
};

struct ib_qp_init_attr {
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *qp_context;
        struct ib_cq           *send_cq;
        struct ib_cq           *recv_cq;
        struct ib_srq          *srq;
        struct ib_qp_cap        cap;
        enum ib_sig_type        sq_sig_type;
        enum ib_qp_type         qp_type;
        u8                      port_num; /* special QP types only */
};

enum ib_rnr_timeout {
        IB_RNR_TIMER_655_36 =  0,
        IB_RNR_TIMER_000_01 =  1,
        IB_RNR_TIMER_000_02 =  2,
        IB_RNR_TIMER_000_03 =  3,
        IB_RNR_TIMER_000_04 =  4,
        IB_RNR_TIMER_000_06 =  5,
        IB_RNR_TIMER_000_08 =  6,
        IB_RNR_TIMER_000_12 =  7,
        IB_RNR_TIMER_000_16 =  8,
        IB_RNR_TIMER_000_24 =  9,
        IB_RNR_TIMER_000_32 = 10,
        IB_RNR_TIMER_000_48 = 11,
        IB_RNR_TIMER_000_64 = 12,
        IB_RNR_TIMER_000_96 = 13,
        IB_RNR_TIMER_001_28 = 14,
        IB_RNR_TIMER_001_92 = 15,
        IB_RNR_TIMER_002_56 = 16,
        IB_RNR_TIMER_003_84 = 17,
        IB_RNR_TIMER_005_12 = 18,
        IB_RNR_TIMER_007_68 = 19,
        IB_RNR_TIMER_010_24 = 20,
        IB_RNR_TIMER_015_36 = 21,
        IB_RNR_TIMER_020_48 = 22,
        IB_RNR_TIMER_030_72 = 23,
        IB_RNR_TIMER_040_96 = 24,
        IB_RNR_TIMER_061_44 = 25,
        IB_RNR_TIMER_081_92 = 26,
        IB_RNR_TIMER_122_88 = 27,
        IB_RNR_TIMER_163_84 = 28,
        IB_RNR_TIMER_245_76 = 29,
        IB_RNR_TIMER_327_68 = 30,
        IB_RNR_TIMER_491_52 = 31
};

enum ib_qp_attr_mask {
        IB_QP_STATE                     = 1,
        IB_QP_CUR_STATE                 = (1<<1),
        IB_QP_EN_SQD_ASYNC_NOTIFY       = (1<<2),
        IB_QP_ACCESS_FLAGS              = (1<<3),
        IB_QP_PKEY_INDEX                = (1<<4),
        IB_QP_PORT                      = (1<<5),
        IB_QP_QKEY                      = (1<<6),
        IB_QP_AV                        = (1<<7),
        IB_QP_PATH_MTU                  = (1<<8),
        IB_QP_TIMEOUT                   = (1<<9),
        IB_QP_RETRY_CNT                 = (1<<10),
        IB_QP_RNR_RETRY                 = (1<<11),
        IB_QP_RQ_PSN                    = (1<<12),
        IB_QP_MAX_QP_RD_ATOMIC          = (1<<13),
        IB_QP_ALT_PATH                  = (1<<14),
        IB_QP_MIN_RNR_TIMER             = (1<<15),
        IB_QP_SQ_PSN                    = (1<<16),
        IB_QP_MAX_DEST_RD_ATOMIC        = (1<<17),
        IB_QP_PATH_MIG_STATE            = (1<<18),
        IB_QP_CAP                       = (1<<19),
        IB_QP_DEST_QPN                  = (1<<20)
};

enum ib_qp_state {
        IB_QPS_RESET,
        IB_QPS_INIT,
        IB_QPS_RTR,
        IB_QPS_RTS,
        IB_QPS_SQD,
        IB_QPS_SQE,
        IB_QPS_ERR
};

enum ib_mig_state {
        IB_MIG_MIGRATED,
        IB_MIG_REARM,
        IB_MIG_ARMED
};

struct ib_qp_attr {
        enum ib_qp_state        qp_state;
        enum ib_qp_state        cur_qp_state;
        enum ib_mtu             path_mtu;
        enum ib_mig_state       path_mig_state;
        u32                     qkey;
        u32                     rq_psn;
        u32                     sq_psn;
        u32                     dest_qp_num;
        int                     qp_access_flags;
        struct ib_qp_cap        cap;
        struct ib_ah_attr       ah_attr;
        struct ib_ah_attr       alt_ah_attr;
        u16                     pkey_index;
        u16                     alt_pkey_index;
        u8                      en_sqd_async_notify;
        u8                      sq_draining;
        u8                      max_rd_atomic;
        u8                      max_dest_rd_atomic;
        u8                      min_rnr_timer;
        u8                      port_num;
        u8                      timeout;
        u8                      retry_cnt;
        u8                      rnr_retry;
        u8                      alt_port_num;
        u8                      alt_timeout;
};

enum ib_wr_opcode {
        IB_WR_RDMA_WRITE,
        IB_WR_RDMA_WRITE_WITH_IMM,
        IB_WR_SEND,
        IB_WR_SEND_WITH_IMM,
        IB_WR_RDMA_READ,
        IB_WR_ATOMIC_CMP_AND_SWP,
        IB_WR_ATOMIC_FETCH_AND_ADD
};

enum ib_send_flags {
        IB_SEND_FENCE           = 1,
        IB_SEND_SIGNALED        = (1<<1),
        IB_SEND_SOLICITED       = (1<<2),
        IB_SEND_INLINE          = (1<<3)
};

struct ib_sge {
        u64     addr;
        u32     length;
        u32     lkey;
};

struct ib_send_wr {
        struct ib_send_wr      *next;
        u64                     wr_id;
        struct ib_sge          *sg_list;
        int                     num_sge;
        enum ib_wr_opcode       opcode;
        int                     send_flags;
        __be32                  imm_data;
        union {
                struct {
                        u64     remote_addr;
                        u32     rkey;
                } rdma;
                struct {
                        u64     remote_addr;
                        u64     compare_add;
                        u64     swap;
                        u32     rkey;
                } atomic;
                struct {
                        struct ib_ah *ah;
                        u32     remote_qpn;
                        u32     remote_qkey;
                        u16     pkey_index; /* valid for GSI only */
                        u8      port_num;   /* valid for DR SMPs on switch only */
                } ud;
        } wr;
};

struct ib_recv_wr {
        struct ib_recv_wr      *next;
        u64                     wr_id;
        struct ib_sge          *sg_list;
        int                     num_sge;
};

enum ib_access_flags {
        IB_ACCESS_LOCAL_WRITE   = 1,
        IB_ACCESS_REMOTE_WRITE  = (1<<1),
        IB_ACCESS_REMOTE_READ   = (1<<2),
        IB_ACCESS_REMOTE_ATOMIC = (1<<3),
        IB_ACCESS_MW_BIND       = (1<<4)
};

struct ib_phys_buf {
        u64      addr;
        u64      size;
};

struct ib_mr_attr {
        struct ib_pd    *pd;
        u64             device_virt_addr;
        u64             size;
        int             mr_access_flags;
        u32             lkey;
        u32             rkey;
};

enum ib_mr_rereg_flags {
        IB_MR_REREG_TRANS       = 1,
        IB_MR_REREG_PD          = (1<<1),
        IB_MR_REREG_ACCESS      = (1<<2)
};

struct ib_mw_bind {
        struct ib_mr   *mr;
        u64             wr_id;
        u64             addr;
        u32             length;
        int             send_flags;
        int             mw_access_flags;
};

struct ib_fmr_attr {
        int     max_pages;
        int     max_maps;
        u8      page_shift;
};

struct ib_ucontext {
        struct ib_device       *device;
        struct list_head        pd_list;
        struct list_head        mr_list;
        struct list_head        mw_list;
        struct list_head        cq_list;
        struct list_head        qp_list;
        struct list_head        srq_list;
        struct list_head        ah_list;
};

struct ib_uobject {
        u64                     user_handle;    /* handle given to us by userspace */
        struct ib_ucontext     *context;        /* associated user context */
        void                   *object;         /* containing object */
        struct list_head        list;           /* link to context's list */
        u32                     id;             /* index into kernel idr */
        struct kref             ref;
        struct rw_semaphore     mutex;          /* protects .live */
        int                     live;
};

struct ib_umem {
        unsigned long           user_base;
        unsigned long           virt_base;
        size_t                  length;
        int                     offset;
        int                     page_size;
        int                     writable;
        struct list_head        chunk_list;
};

struct ib_umem_chunk {
        struct list_head        list;
        int                     nents;
        int                     nmap;
        struct scatterlist      page_list[0];
};

struct ib_udata {
        void __user *inbuf;
        void __user *outbuf;
        size_t       inlen;
        size_t       outlen;
};

#define IB_UMEM_MAX_PAGE_CHUNK                                          \
        ((PAGE_SIZE - offsetof(struct ib_umem_chunk, page_list)) /      \
         ((void *) &((struct ib_umem_chunk *) 0)->page_list[1] -        \
          (void *) &((struct ib_umem_chunk *) 0)->page_list[0]))

struct ib_umem_object {
        struct ib_uobject       uobject;
        struct ib_umem          umem;
};

struct ib_pd {
        struct ib_device       *device;
        struct ib_uobject      *uobject;
        atomic_t                usecnt; /* count all resources */
};

struct ib_ah {
        struct ib_device        *device;
        struct ib_pd            *pd;
        struct ib_uobject       *uobject;
};

typedef void (*ib_comp_handler)(struct ib_cq *cq, void *cq_context);

struct ib_cq {
        struct ib_device       *device;
        struct ib_uobject      *uobject;
        ib_comp_handler         comp_handler;
        void                  (*event_handler)(struct ib_event *, void *);
        void *                  cq_context;
        int                     cqe;
        atomic_t                usecnt; /* count number of work queues */
};

struct ib_srq {
        struct ib_device       *device;
        struct ib_pd           *pd;
        struct ib_uobject      *uobject;
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *srq_context;
        atomic_t                usecnt;
};

struct ib_qp {
        struct ib_device       *device;
        struct ib_pd           *pd;
        struct ib_cq           *send_cq;
        struct ib_cq           *recv_cq;
        struct ib_srq          *srq;
        struct ib_uobject      *uobject;
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *qp_context;
        u32                     qp_num;
        enum ib_qp_type         qp_type;
};

struct ib_mr {
        struct ib_device  *device;
        struct ib_pd      *pd;
        struct ib_uobject *uobject;
        u32                lkey;
        u32                rkey;
        atomic_t           usecnt; /* count number of MWs */
};

struct ib_mw {
        struct ib_device        *device;
        struct ib_pd            *pd;
        struct ib_uobject       *uobject;
        u32                     rkey;
};

struct ib_fmr {
        struct ib_device        *device;
        struct ib_pd            *pd;
        struct list_head        list;
        u32                     lkey;
        u32                     rkey;
};

struct ib_mad;
struct ib_grh;

enum ib_process_mad_flags {
        IB_MAD_IGNORE_MKEY      = 1,
        IB_MAD_IGNORE_BKEY      = 2,
        IB_MAD_IGNORE_ALL       = IB_MAD_IGNORE_MKEY | IB_MAD_IGNORE_BKEY
};

enum ib_mad_result {
        IB_MAD_RESULT_FAILURE  = 0,      /* (!SUCCESS is the important flag) */
        IB_MAD_RESULT_SUCCESS  = 1 << 0, /* MAD was successfully processed   */
        IB_MAD_RESULT_REPLY    = 1 << 1, /* Reply packet needs to be sent    */
        IB_MAD_RESULT_CONSUMED = 1 << 2  /* Packet consumed: stop processing */
};

#define IB_DEVICE_NAME_MAX 64

struct ib_cache {
        rwlock_t                lock;
        struct ib_event_handler event_handler;
        struct ib_pkey_cache  **pkey_cache;
        struct ib_gid_cache   **gid_cache;
        u8                     *lmc_cache;
};

struct ib_device {
        struct device                *dma_device;

        char                          name[IB_DEVICE_NAME_MAX];

        struct list_head              event_handler_list;
        spinlock_t                    event_handler_lock;

        struct list_head              core_list;
        struct list_head              client_data_list;
        spinlock_t                    client_data_lock;

        struct ib_cache               cache;

        u32                           flags;

        int                        (*query_device)(struct ib_device *device,
                                                   struct ib_device_attr *device_attr);
        int                        (*query_port)(struct ib_device *device,
                                                 u8 port_num,
                                                 struct ib_port_attr *port_attr);
        int                        (*query_gid)(struct ib_device *device,
                                                u8 port_num, int index,
                                                union ib_gid *gid);
        int                        (*query_pkey)(struct ib_device *device,
                                                 u8 port_num, u16 index, u16 *pkey);
        int                        (*modify_device)(struct ib_device *device,
                                                    int device_modify_mask,
                                                    struct ib_device_modify *device_modify);
        int                        (*modify_port)(struct ib_device *device,
                                                  u8 port_num, int port_modify_mask,
                                                  struct ib_port_modify *port_modify);
        struct ib_ucontext *       (*alloc_ucontext)(struct ib_device *device,
                                                     struct ib_udata *udata);
        int                        (*dealloc_ucontext)(struct ib_ucontext *context);
        int                        (*mmap)(struct ib_ucontext *context,
                                           struct vm_area_struct *vma);
        struct ib_pd *             (*alloc_pd)(struct ib_device *device,
                                               struct ib_ucontext *context,
                                               struct ib_udata *udata);
        int                        (*dealloc_pd)(struct ib_pd *pd);
        struct ib_ah *             (*create_ah)(struct ib_pd *pd,
                                                struct ib_ah_attr *ah_attr);
        int                        (*modify_ah)(struct ib_ah *ah,
                                                struct ib_ah_attr *ah_attr);
        int                        (*query_ah)(struct ib_ah *ah,
                                               struct ib_ah_attr *ah_attr);
        int                        (*destroy_ah)(struct ib_ah *ah);
        struct ib_srq *            (*create_srq)(struct ib_pd *pd,
                                                 struct ib_srq_init_attr *srq_init_attr,
                                                 struct ib_udata *udata);
        int                        (*modify_srq)(struct ib_srq *srq,
                                                 struct ib_srq_attr *srq_attr,
                                                 enum ib_srq_attr_mask srq_attr_mask);
        int                        (*query_srq)(struct ib_srq *srq,
                                                struct ib_srq_attr *srq_attr);
        int                        (*destroy_srq)(struct ib_srq *srq);
        int                        (*post_srq_recv)(struct ib_srq *srq,
                                                    struct ib_recv_wr *recv_wr,
                                                    struct ib_recv_wr **bad_recv_wr);
        struct ib_qp *             (*create_qp)(struct ib_pd *pd,
                                                struct ib_qp_init_attr *qp_init_attr,
                                                struct ib_udata *udata);
        int                        (*modify_qp)(struct ib_qp *qp,
                                                struct ib_qp_attr *qp_attr,
                                                int qp_attr_mask);
        int                        (*query_qp)(struct ib_qp *qp,
                                               struct ib_qp_attr *qp_attr,
                                               int qp_attr_mask,
                                               struct ib_qp_init_attr *qp_init_attr);
        int                        (*destroy_qp)(struct ib_qp *qp);
        int                        (*post_send)(struct ib_qp *qp,
                                                struct ib_send_wr *send_wr,
                                                struct ib_send_wr **bad_send_wr);
        int                        (*post_recv)(struct ib_qp *qp,
                                                struct ib_recv_wr *recv_wr,
                                                struct ib_recv_wr **bad_recv_wr);
        struct ib_cq *             (*create_cq)(struct ib_device *device, int cqe,
                                                struct ib_ucontext *context,
                                                struct ib_udata *udata);
        int                        (*destroy_cq)(struct ib_cq *cq);
        int                        (*resize_cq)(struct ib_cq *cq, int cqe,
                                                struct ib_udata *udata);
        int                        (*poll_cq)(struct ib_cq *cq, int num_entries,
                                              struct ib_wc *wc);
        int                        (*peek_cq)(struct ib_cq *cq, int wc_cnt);
        int                        (*req_notify_cq)(struct ib_cq *cq,
                                                    enum ib_cq_notify cq_notify);
        int                        (*req_ncomp_notif)(struct ib_cq *cq,
                                                      int wc_cnt);
        struct ib_mr *             (*get_dma_mr)(struct ib_pd *pd,
                                                 int mr_access_flags);
        struct ib_mr *             (*reg_phys_mr)(struct ib_pd *pd,
                                                  struct ib_phys_buf *phys_buf_array,
                                                  int num_phys_buf,
                                                  int mr_access_flags,
                                                  u64 *iova_start);
        struct ib_mr *             (*reg_user_mr)(struct ib_pd *pd,
                                                  struct ib_umem *region,
                                                  int mr_access_flags,
                                                  struct ib_udata *udata);
        int                        (*query_mr)(struct ib_mr *mr,
                                               struct ib_mr_attr *mr_attr);
        int                        (*dereg_mr)(struct ib_mr *mr);
        int                        (*rereg_phys_mr)(struct ib_mr *mr,
                                                    int mr_rereg_mask,
                                                    struct ib_pd *pd,
                                                    struct ib_phys_buf *phys_buf_array,
                                                    int num_phys_buf,
                                                    int mr_access_flags,
                                                    u64 *iova_start);
        struct ib_mw *             (*alloc_mw)(struct ib_pd *pd);
        int                        (*bind_mw)(struct ib_qp *qp,
                                              struct ib_mw *mw,
                                              struct ib_mw_bind *mw_bind);
        int                        (*dealloc_mw)(struct ib_mw *mw);
        struct ib_fmr *            (*alloc_fmr)(struct ib_pd *pd,
                                                int mr_access_flags,
                                                struct ib_fmr_attr *fmr_attr);
        int                        (*map_phys_fmr)(struct ib_fmr *fmr,
                                                   u64 *page_list, int list_len,
                                                   u64 iova);
        int                        (*unmap_fmr)(struct list_head *fmr_list);
        int                        (*dealloc_fmr)(struct ib_fmr *fmr);
        int                        (*attach_mcast)(struct ib_qp *qp,
                                                   union ib_gid *gid,
                                                   u16 lid);
        int                        (*detach_mcast)(struct ib_qp *qp,
                                                   union ib_gid *gid,
                                                   u16 lid);
        int                        (*process_mad)(struct ib_device *device,
                                                  int process_mad_flags,
                                                  u8 port_num,
                                                  struct ib_wc *in_wc,
                                                  struct ib_grh *in_grh,
                                                  struct ib_mad *in_mad,
                                                  struct ib_mad *out_mad);

        struct module               *owner;
        struct class_device          class_dev;
        struct kobject               ports_parent;
        struct list_head             port_list;

        enum {
                IB_DEV_UNINITIALIZED,
                IB_DEV_REGISTERED,
                IB_DEV_UNREGISTERED
        }                            reg_state;

        u64                          uverbs_cmd_mask;
        int                          uverbs_abi_ver;

        char                         node_desc[64];
        __be64                       node_guid;
        u8                           node_type;
        u8                           phys_port_cnt;
};

struct ib_client {
        char  *name;
        void (*add)   (struct ib_device *);
        void (*remove)(struct ib_device *);

        struct list_head list;
};

struct ib_device *ib_alloc_device(size_t size);
void ib_dealloc_device(struct ib_device *device);

int ib_register_device   (struct ib_device *device);
void ib_unregister_device(struct ib_device *device);

int ib_register_client   (struct ib_client *client);
void ib_unregister_client(struct ib_client *client);

void *ib_get_client_data(struct ib_device *device, struct ib_client *client);
void  ib_set_client_data(struct ib_device *device, struct ib_client *client,
                         void *data);

static inline int ib_copy_from_udata(void *dest, struct ib_udata *udata, size_t len)
{
        return copy_from_user(dest, udata->inbuf, len) ? -EFAULT : 0;
}

static inline int ib_copy_to_udata(struct ib_udata *udata, void *src, size_t len)
{
        return copy_to_user(udata->outbuf, src, len) ? -EFAULT : 0;
}

/**
 * ib_modify_qp_is_ok - Check that the supplied attribute mask
 * contains all required attributes and no attributes not allowed for
 * the given QP state transition.
 * @cur_state: Current QP state
 * @next_state: Next QP state
 * @type: QP type
 * @mask: Mask of supplied QP attributes
 *
 * This function is a helper function that a low-level driver's
 * modify_qp method can use to validate the consumer's input.  It
 * checks that cur_state and next_state are valid QP states, that a
 * transition from cur_state to next_state is allowed by the IB spec,
 * and that the attribute mask supplied is allowed for the transition.
 */
int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
                       enum ib_qp_type type, enum ib_qp_attr_mask mask);

int ib_register_event_handler  (struct ib_event_handler *event_handler);
int ib_unregister_event_handler(struct ib_event_handler *event_handler);
void ib_dispatch_event(struct ib_event *event);

int ib_query_device(struct ib_device *device,
                    struct ib_device_attr *device_attr);

int ib_query_port(struct ib_device *device,
                  u8 port_num, struct ib_port_attr *port_attr);

int ib_query_gid(struct ib_device *device,
                 u8 port_num, int index, union ib_gid *gid);

int ib_query_pkey(struct ib_device *device,
                  u8 port_num, u16 index, u16 *pkey);

int ib_modify_device(struct ib_device *device,
                     int device_modify_mask,
                     struct ib_device_modify *device_modify);

int ib_modify_port(struct ib_device *device,
                   u8 port_num, int port_modify_mask,
                   struct ib_port_modify *port_modify);

/**
 * ib_alloc_pd - Allocates an unused protection domain.
 * @device: The device on which to allocate the protection domain.
 *
 * A protection domain object provides an association between QPs, shared
 * receive queues, address handles, memory regions, and memory windows.
 */
struct ib_pd *ib_alloc_pd(struct ib_device *device);

/**
 * ib_dealloc_pd - Deallocates a protection domain.
 * @pd: The protection domain to deallocate.
 */
int ib_dealloc_pd(struct ib_pd *pd);

/**
 * ib_create_ah - Creates an address handle for the given address vector.
 * @pd: The protection domain associated with the address handle.
 * @ah_attr: The attributes of the address vector.
 *
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr);

/**
 * ib_init_ah_from_wc - Initializes address handle attributes from a
 *   work completion.
 * @device: Device on which the received message arrived.
 * @port_num: Port on which the received message arrived.
 * @wc: Work completion associated with the received message.
 * @grh: References the received global route header.  This parameter is
 *   ignored unless the work completion indicates that the GRH is valid.
 * @ah_attr: Returned attributes that can be used when creating an address
 *   handle for replying to the message.
 */
int ib_init_ah_from_wc(struct ib_device *device, u8 port_num, struct ib_wc *wc,
                       struct ib_grh *grh, struct ib_ah_attr *ah_attr);

/**
 * ib_create_ah_from_wc - Creates an address handle associated with the
 *   sender of the specified work completion.
 * @pd: The protection domain associated with the address handle.
 * @wc: Work completion information associated with a received message.
 * @grh: References the received global route header.  This parameter is
 *   ignored unless the work completion indicates that the GRH is valid.
 * @port_num: The outbound port number to associate with the address.
 *
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, struct ib_wc *wc,
                                   struct ib_grh *grh, u8 port_num);

/**
 * ib_modify_ah - Modifies the address vector associated with an address
 *   handle.
 * @ah: The address handle to modify.
 * @ah_attr: The new address vector attributes to associate with the
 *   address handle.
 */
int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr);

/**
 * ib_query_ah - Queries the address vector associated with an address
 *   handle.
 * @ah: The address handle to query.
 * @ah_attr: The address vector attributes associated with the address
 *   handle.
 */
int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr);

/**
 * ib_destroy_ah - Destroys an address handle.
 * @ah: The address handle to destroy.
 */
int ib_destroy_ah(struct ib_ah *ah);

/**
 * ib_create_srq - Creates a SRQ associated with the specified protection
 *   domain.
 * @pd: The protection domain associated with the SRQ.
 * @srq_init_attr: A list of initial attributes required to create the
 *   SRQ.  If SRQ creation succeeds, then the attributes are updated to
 *   the actual capabilities of the created SRQ.
 *
 * srq_attr->max_wr and srq_attr->max_sge are read the determine the
 * requested size of the SRQ, and set to the actual values allocated
 * on return.  If ib_create_srq() succeeds, then max_wr and max_sge
 * will always be at least as large as the requested values.
 */
struct ib_srq *ib_create_srq(struct ib_pd *pd,
                             struct ib_srq_init_attr *srq_init_attr);

/**
 * ib_modify_srq - Modifies the attributes for the specified SRQ.
 * @srq: The SRQ to modify.
 * @srq_attr: On input, specifies the SRQ attributes to modify.  On output,
 *   the current values of selected SRQ attributes are returned.
 * @srq_attr_mask: A bit-mask used to specify which attributes of the SRQ
 *   are being modified.
 *
 * The mask may contain IB_SRQ_MAX_WR to resize the SRQ and/or
 * IB_SRQ_LIMIT to set the SRQ's limit and request notification when
 * the number of receives queued drops below the limit.
 */
int ib_modify_srq(struct ib_srq *srq,
                  struct ib_srq_attr *srq_attr,
                  enum ib_srq_attr_mask srq_attr_mask);

/**
 * ib_query_srq - Returns the attribute list and current values for the
 *   specified SRQ.
 * @srq: The SRQ to query.
 * @srq_attr: The attributes of the specified SRQ.
 */
int ib_query_srq(struct ib_srq *srq,
                 struct ib_srq_attr *srq_attr);

/**
 * ib_destroy_srq - Destroys the specified SRQ.
 * @srq: The SRQ to destroy.
 */
int ib_destroy_srq(struct ib_srq *srq);

/**
 * ib_post_srq_recv - Posts a list of work requests to the specified SRQ.
 * @srq: The SRQ to post the work request on.
 * @recv_wr: A list of work requests to post on the receive queue.
 * @bad_recv_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_srq_recv(struct ib_srq *srq,
                                   struct ib_recv_wr *recv_wr,
                                   struct ib_recv_wr **bad_recv_wr)
{
        return srq->device->post_srq_recv(srq, recv_wr, bad_recv_wr);
}

/**
 * ib_create_qp - Creates a QP associated with the specified protection
 *   domain.
 * @pd: The protection domain associated with the QP.
 * @qp_init_attr: A list of initial attributes required to create the
 *   QP.  If QP creation succeeds, then the attributes are updated to
 *   the actual capabilities of the created QP.
 */
struct ib_qp *ib_create_qp(struct ib_pd *pd,
                           struct ib_qp_init_attr *qp_init_attr);

/**
 * ib_modify_qp - Modifies the attributes for the specified QP and then
 *   transitions the QP to the given state.
 * @qp: The QP to modify.
 * @qp_attr: On input, specifies the QP attributes to modify.  On output,
 *   the current values of selected QP attributes are returned.
 * @qp_attr_mask: A bit-mask used to specify which attributes of the QP
 *   are being modified.
 */
int ib_modify_qp(struct ib_qp *qp,
                 struct ib_qp_attr *qp_attr,
                 int qp_attr_mask);

/**
 * ib_query_qp - Returns the attribute list and current values for the
 *   specified QP.
 * @qp: The QP to query.
 * @qp_attr: The attributes of the specified QP.
 * @qp_attr_mask: A bit-mask used to select specific attributes to query.
 * @qp_init_attr: Additional attributes of the selected QP.
 *
 * The qp_attr_mask may be used to limit the query to gathering only the
 * selected attributes.
 */
int ib_query_qp(struct ib_qp *qp,
                struct ib_qp_attr *qp_attr,
                int qp_attr_mask,
                struct ib_qp_init_attr *qp_init_attr);

/**
 * ib_destroy_qp - Destroys the specified QP.
 * @qp: The QP to destroy.
 */
int ib_destroy_qp(struct ib_qp *qp);

/**
 * ib_post_send - Posts a list of work requests to the send queue of
 *   the specified QP.
 * @qp: The QP to post the work request on.
 * @send_wr: A list of work requests to post on the send queue.
 * @bad_send_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_send(struct ib_qp *qp,
                               struct ib_send_wr *send_wr,
                               struct ib_send_wr **bad_send_wr)
{
        return qp->device->post_send(qp, send_wr, bad_send_wr);
}

/**
 * ib_post_recv - Posts a list of work requests to the receive queue of
 *   the specified QP.
 * @qp: The QP to post the work request on.
 * @recv_wr: A list of work requests to post on the receive queue.
 * @bad_recv_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_recv(struct ib_qp *qp,
                               struct ib_recv_wr *recv_wr,
                               struct ib_recv_wr **bad_recv_wr)
{
        return qp->device->post_recv(qp, recv_wr, bad_recv_wr);
}

/**
 * ib_create_cq - Creates a CQ on the specified device.
 * @device: The device on which to create the CQ.
 * @comp_handler: A user-specified callback that is invoked when a
 *   completion event occurs on the CQ.
 * @event_handler: A user-specified callback that is invoked when an
 *   asynchronous event not associated with a completion occurs on the CQ.
 * @cq_context: Context associated with the CQ returned to the user via
 *   the associated completion and event handlers.
 * @cqe: The minimum size of the CQ.
 *
 * Users can examine the cq structure to determine the actual CQ size.
 */
struct ib_cq *ib_create_cq(struct ib_device *device,
                           ib_comp_handler comp_handler,
                           void (*event_handler)(struct ib_event *, void *),
                           void *cq_context, int cqe);

/**
 * ib_resize_cq - Modifies the capacity of the CQ.
 * @cq: The CQ to resize.
 * @cqe: The minimum size of the CQ.
 *
 * Users can examine the cq structure to determine the actual CQ size.
 */
int ib_resize_cq(struct ib_cq *cq, int cqe);

/**
 * ib_destroy_cq - Destroys the specified CQ.
 * @cq: The CQ to destroy.
 */
int ib_destroy_cq(struct ib_cq *cq);

/**
 * ib_poll_cq - poll a CQ for completion(s)
 * @cq:the CQ being polled
 * @num_entries:maximum number of completions to return
 * @wc:array of at least @num_entries &struct ib_wc where completions
 *   will be returned
 *
 * Poll a CQ for (possibly multiple) completions.  If the return value
 * is < 0, an error occurred.  If the return value is >= 0, it is the
 * number of completions returned.  If the return value is
 * non-negative and < num_entries, then the CQ was emptied.
 */
static inline int ib_poll_cq(struct ib_cq *cq, int num_entries,
                             struct ib_wc *wc)
{
        return cq->device->poll_cq(cq, num_entries, wc);
}

/**
 * ib_peek_cq - Returns the number of unreaped completions currently
 *   on the specified CQ.
 * @cq: The CQ to peek.
 * @wc_cnt: A minimum number of unreaped completions to check for.
 *
 * If the number of unreaped completions is greater than or equal to wc_cnt,
 * this function returns wc_cnt, otherwise, it returns the actual number of
 * unreaped completions.
 */
int ib_peek_cq(struct ib_cq *cq, int wc_cnt);

/**
 * ib_req_notify_cq - Request completion notification on a CQ.
 * @cq: The CQ to generate an event for.
 * @cq_notify: If set to %IB_CQ_SOLICITED, completion notification will
 *   occur on the next solicited event. If set to %IB_CQ_NEXT_COMP,
 *   notification will occur on the next completion.
 */
static inline int ib_req_notify_cq(struct ib_cq *cq,
                                   enum ib_cq_notify cq_notify)
{
        return cq->device->req_notify_cq(cq, cq_notify);
}

/**
 * ib_req_ncomp_notif - Request completion notification when there are
 *   at least the specified number of unreaped completions on the CQ.
 * @cq: The CQ to generate an event for.
 * @wc_cnt: The number of unreaped completions that should be on the
 *   CQ before an event is generated.
 */
static inline int ib_req_ncomp_notif(struct ib_cq *cq, int wc_cnt)
{
        return cq->device->req_ncomp_notif ?
                cq->device->req_ncomp_notif(cq, wc_cnt) :
                -ENOSYS;
}

/**
 * ib_get_dma_mr - Returns a memory region for system memory that is
 *   usable for DMA.
 * @pd: The protection domain associated with the memory region.
 * @mr_access_flags: Specifies the memory access rights.
 */
struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags);

/**
 * ib_reg_phys_mr - Prepares a virtually addressed memory region for use
 *   by an HCA.
 * @pd: The protection domain associated assigned to the registered region.
 * @phys_buf_array: Specifies a list of physical buffers to use in the
 *   memory region.
 * @num_phys_buf: Specifies the size of the phys_buf_array.
 * @mr_access_flags: Specifies the memory access rights.
 * @iova_start: The offset of the region's starting I/O virtual address.
 */
struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
                             struct ib_phys_buf *phys_buf_array,
                             int num_phys_buf,
                             int mr_access_flags,
                             u64 *iova_start);

/**
 * ib_rereg_phys_mr - Modifies the attributes of an existing memory region.
 *   Conceptually, this call performs the functions deregister memory region
 *   followed by register physical memory region.  Where possible,
 *   resources are reused instead of deallocated and reallocated.
 * @mr: The memory region to modify.
 * @mr_rereg_mask: A bit-mask used to indicate which of the following
 *   properties of the memory region are being modified.
 * @pd: If %IB_MR_REREG_PD is set in mr_rereg_mask, this field specifies
 *   the new protection domain to associated with the memory region,
 *   otherwise, this parameter is ignored.
 * @phys_buf_array: If %IB_MR_REREG_TRANS is set in mr_rereg_mask, this
 *   field specifies a list of physical buffers to use in the new
 *   translation, otherwise, this parameter is ignored.
 * @num_phys_buf: If %IB_MR_REREG_TRANS is set in mr_rereg_mask, this
 *   field specifies the size of the phys_buf_array, otherwise, this
 *   parameter is ignored.
 * @mr_access_flags: If %IB_MR_REREG_ACCESS is set in mr_rereg_mask, this
 *   field specifies the new memory access rights, otherwise, this
 *   parameter is ignored.
 * @iova_start: The offset of the region's starting I/O virtual address.
 */
int ib_rereg_phys_mr(struct ib_mr *mr,
                     int mr_rereg_mask,
                     struct ib_pd *pd,
                     struct ib_phys_buf *phys_buf_array,
                     int num_phys_buf,
                     int mr_access_flags,
                     u64 *iova_start);

/**
 * ib_query_mr - Retrieves information about a specific memory region.
 * @mr: The memory region to retrieve information about.
 * @mr_attr: The attributes of the specified memory region.
 */
int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr);

/**
 * ib_dereg_mr - Deregisters a memory region and removes it from the
 *   HCA translation table.
 * @mr: The memory region to deregister.
 */
int ib_dereg_mr(struct ib_mr *mr);

/**
 * ib_alloc_mw - Allocates a memory window.
 * @pd: The protection domain associated with the memory window.
 */
struct ib_mw *ib_alloc_mw(struct ib_pd *pd);

/**
 * ib_bind_mw - Posts a work request to the send queue of the specified
 *   QP, which binds the memory window to the given address range and
 *   remote access attributes.
 * @qp: QP to post the bind work request on.
 * @mw: The memory window to bind.
 * @mw_bind: Specifies information about the memory window, including
 *   its address range, remote access rights, and associated memory region.
 */
static inline int ib_bind_mw(struct ib_qp *qp,
                             struct ib_mw *mw,
                             struct ib_mw_bind *mw_bind)
{
        /* XXX reference counting in corresponding MR? */
        return mw->device->bind_mw ?
                mw->device->bind_mw(qp, mw, mw_bind) :
                -ENOSYS;
}

/**
 * ib_dealloc_mw - Deallocates a memory window.
 * @mw: The memory window to deallocate.
 */
int ib_dealloc_mw(struct ib_mw *mw);

/**
 * ib_alloc_fmr - Allocates a unmapped fast memory region.
 * @pd: The protection domain associated with the unmapped region.
 * @mr_access_flags: Specifies the memory access rights.
 * @fmr_attr: Attributes of the unmapped region.
 *
 * A fast memory region must be mapped before it can be used as part of
 * a work request.
 */
struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
                            int mr_access_flags,
                            struct ib_fmr_attr *fmr_attr);

/**
 * ib_map_phys_fmr - Maps a list of physical pages to a fast memory region.
 * @fmr: The fast memory region to associate with the pages.
 * @page_list: An array of physical pages to map to the fast memory region.
 * @list_len: The number of pages in page_list.
 * @iova: The I/O virtual address to use with the mapped region.
 */
static inline int ib_map_phys_fmr(struct ib_fmr *fmr,
                                  u64 *page_list, int list_len,
                                  u64 iova)
{
        return fmr->device->map_phys_fmr(fmr, page_list, list_len, iova);
}

/**
 * ib_unmap_fmr - Removes the mapping from a list of fast memory regions.
 * @fmr_list: A linked list of fast memory regions to unmap.
 */
int ib_unmap_fmr(struct list_head *fmr_list);

/**
 * ib_dealloc_fmr - Deallocates a fast memory region.
 * @fmr: The fast memory region to deallocate.
 */
int ib_dealloc_fmr(struct ib_fmr *fmr);

/**
 * ib_attach_mcast - Attaches the specified QP to a multicast group.
 * @qp: QP to attach to the multicast group.  The QP must be type
 *   IB_QPT_UD.
 * @gid: Multicast group GID.
 * @lid: Multicast group LID in host byte order.
 *
 * In order to send and receive multicast packets, subnet
 * administration must have created the multicast group and configured
 * the fabric appropriately.  The port associated with the specified
 * QP must also be a member of the multicast group.
 */
int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);

/**
 * ib_detach_mcast - Detaches the specified QP from a multicast group.
 * @qp: QP to detach from the multicast group.
 * @gid: Multicast group GID.
 * @lid: Multicast group LID in host byte order.
 */
int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);

#endif /* IB_VERBS_H */